Mizuki & Caerula Arbor: Deep Dive

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A list of Mizuki & Caerula Arbor's Deep Explorations, named Deep Dive.

Unlike Phantom & Crimson Solitaire's Deep Investigations, Deep Dives are divided into three categories, each having similar environment changes and only the first Dive of the category that is available at first, with the rest being unlocked by completing the previous Dive's Mission Objective.

Abyss Rejection

In these Deep Dives, the player starts with 70 Light and loses 10 Light after clearing an operation after losing Life Point(s).

#1-1: Esthesia Lapse
IS3 Investigation 1-1.png
Only by time the wounds begin to close do the earliest pain signals finally reach the brain.

  • Begin with the following collectible: Castle's Offspring
  • Neurodegeneration intensified; Operators will be Frozen for 30s after deployment, but gain +200% ATK and DEF for the duration
  • Initial Light decreased, greater Light loss upon receiving Objective HP damage
  • The ocean environment has changed; please proceed with caution
Mission Objective Enter 5F.
Starting resources
4 Life Points.png 6 Hope.png 8 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles Castle's Offspring.png Castle's Offspring (friendly DEF +300 and RES +30 after deployed for 100 seconds)
Available Squads All
Environment The Rejection is set to Neurodegeneration+, an enhanced version of Neurodegeneration where the Freeze effect lasts twice as long (30 seconds) but the Operator has their ATK and DEF tripled while they are Frozen this way.
Rewards
Polymerization Preparation.png
1
Refined Solvent.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15
#1-2: Exacerbated Mutation
IS3 Investigation 1-2.png
The flesh warps even further, but the mind remains sharp.

  • Begin with the following collectibles: Rhodes Island Tactical Transceiver, Four-Leaf Clover Fossil
  • Metastatic Aberration intensified: Operators have -75% Max HP, ATK, DEF, Deployment Cost, and Redeployment Time, but start with +80 SP
  • Initial Light decreased, greater Light loss upon receiving Objective HP damage
  • The ocean environment has changed; please proceed with caution
Mission Objective Recruit 15 Operators (including those recruited at the start).
Starting resources
4 Life Points.png 6 Hope.png 8 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles
Available Squads All
Environment The Rejection is set to Metastatic Aberration+, an enhanced version of Metastatic Aberration where the max. HP/ATK/DEF/cost/redeployment time reduction is increased to 75% but the Operator's initial SP is increased by 80.
Rewards
Bipolar Nanoflake.png
1
Keton Colloid.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15
#1-3: Adrenaline Rush
IS3 Investigation 1-3.png
Blood loss stimulates the survival instinct; there is only a thin line between victory and retreat.

  • Begin with the following collectibles: Coin-Operated Toy, Chivalric Commandments - New Edition
  • Hemopoetic Inhibition intensified: Operators lose HP at a faster rate when their HP is not full, but gain increased ATK based on how low their HP is
  • Initial Light decreased, greater Light loss upon receiving Objective HP damage
  • The ocean environment has changed; please proceed with caution
Mission Objective Obtain 50 Originium Ingot icon.png (those given at the start are not counted)
Starting resources
4 Life Points.png 6 Hope.png 32 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles
Available Squads All
Environment The Rejection is set to Hemopoetic Inhibition+, an enhanced version of Hemopoetic Inhibition where the HP loss is doubled (to 300 HP/sec.) but the Operator's ATK is increased by 1.2% for every 1% of their missing HP.
Rewards
D32 Steel.png
1
Crystalline Circuit.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15
#1-4: Mania
IS3 Investigation 1-4.png
When having orders becomes a hypothetical...

  • Begin with the following collectible: Three-Key Contract
  • Concentration Disorder intensified; All Operators will automatically activate their skills, and while no skill is active, have gradually increased ATK and gradually decreased ASPD; this effect resets when the skill duration ends
  • Initial Light decreased, greater Light loss upon receiving Objective HP damage
  • The ocean environment has changed; please proceed with caution
Mission Objective Use 3 Key icon.png.
Starting resources
4 Life Points.png 6 Hope.png 8 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles Three-Key Contract.png Three-Key Contract (+3 Key icon.png)
Available Squads All
Environment The Rejection is set to Concentration Disorder+, an enhanced version of Concentration Disorder where the Operator has their ATK increased by 2% but ASPD decreased by 2 every second when their skill is not active, up to 30 seconds (for a total of +60% ATK and -60 ASPD); the ATK buff and ASPD debuff resets after the skill expires once activated.
Rewards
Crystalline Electronic Unit.png
1
Manganese Trihydrate.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15

Heed the Call

In these Deep Dives:

  • Enlightenments are enhanced with changes/additions listed below.
    • Ursus' Warcry > Ursus' Warcry+: The enemy ATK and speed debuff lasts 10 times as long (to 300 seconds, or 5 minutes).
    • Yan's Vicissitudes > Yan's Vicissitudes+: The SP generated is doubled (to 4 SP/sec.).
    • Columbia's Inspiration > Columbia's Inspiration+: The Command EXP awarded is increased to 120.
    • Sami's Tenacity > Sami's Tenacity+: The HP regeneration rate is doubled (to 100 HP/sec.).
    • Victoria's Honor > Victoria's Honor+: The Physical/Arts dodge proc chance is increased to 55%.
    • Leithanien's Elegance > Leithanien's Elegance+: The DEF and RES buff are increased to 500 and 50, respectively.
    • Sargon's Generosity > Sargon's Generosity+: The Collectibles awarded are doubled (for a total of 4 random Collectibles).
  • If the player has received all of the upgraded Enlightenments, the next Enlightenment received will always be the normal version of Sargon's Generosity.
  • The results of the die roll when entering a new floor are modified to those listed in the table below.
Light Side
1 2 3 4 5 6 7 8 9 10 11 12
100 S S S S S F F F F F F F
50–99 T T T S S F F F F F F F
1–49 T T T T T F F F F F F F
0 C C C C C T T F F F F F
Result
  • [F – Favored by Fortune] Obtained Enlightenment <{name}>: The player will receive an Enlightenment.
  • [S – Smooth Sailing] The seas are calm, and nothing unusual is afoot (nothing happens)
  • [T – Twists and Turns] Operator {name} has been afflicted with the <{name}> Rejection: A random Operator is afflicted with Rejection.
  • [C – Cursed] Operator {names} has been afflicted with the <{name}> Rejection: Two random Operators are afflicted with Rejection.
#2-1: Terra's Dawnlight
IS3 Investigation 2-1.png
May Terra bestow us the courage to cast our gaze further into the distance.

  • Begin with the following collectible: Inquisitor's Scripture Cloth
  • Revelation[sic] effects enhanced
  • Revelations are obtainable during any Light value
  • The ocean environment has changed; please proceed with caution
Mission Objective Roll 7 die.
Starting resources
4 Life Points.png 6 Hope.png 16 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles Inquisitor's Scripture Cloth.png Inquisitor's Scripture Cloth (+1 die roll from clearing operations)
Available Squads All
Environment No changes
Rewards
D32 Steel.png
1
Orirock Concentration.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15
#2-2: Parliament's Messenger
IS3 Investigation 2-2.png
With a unanimous resolution of the members—

  • Begin with the following collectible: Old Steam Armor
  • Revelation effects enhanced; begin with the following Revelation: Victoria's Honor
  • Revelations are obtainable during any Light value
  • The ocean environment has changed; please proceed with caution
Mission Objective Obtain 30 Hope.png (those given at the start are not counted).
Starting resources
4 Life Points.png 6 Hope.png 8 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles Old Steam Armor 2.png Old Steam Armor (friendly DEF +35%)
Available Squads All
Environment Victoria's Honor+ is given at the start.
Rewards
Crystalline Electronic Unit.png
1
Polymerized Gel.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15
#2-3: Empresses' Voice
IS3 Investigation 2-3.png
On behalf of the Empresses, I bring a message to the sea—

  • Begin with the following collectibles: Broken Wand - Arts Weaving, Broken Wand - Malediction
  • Revelation effects enhanced; begin with the following Revelations: Leithanien's Elegance, as well as another random Revelation
  • Revelations are obtainable during any Light value
  • The ocean environment has changed; please proceed with caution
Mission Objective Obtain 15 Collectibles (those given at the start are not counted).
Starting resources
4 Life Points.png 6 Hope.png 8 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles
Available Squads All
Environment Leithanien's Elegance+ and a different, random Enlightenment are given at the start.
Rewards
Polymerization Preparation.png
1
Cutting Fluid Solution.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15
#2-4: Coronation
IS3 Investigation 2-4.png
The waves shall crown you.

  • Begin with the following collectibles: King's New Lance, King's Staff, King's Crown
  • Revelation effects enhanced; begin with four random Revelations
  • Revelations are obtainable during any Light value
  • The ocean environment has changed; please proceed with caution
Mission Objective Complete the run.
Starting resources
1 Life Points.png 6 Hope.png 8 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles
  • King's Crown.png King's Crown (friendly ATK +50%, or +150% if the player have at least three "King's" Collectibles, when there is only 1 Life Points.png remaining)
  • King's New Lance.png King's New Lance (friendly ASPD +50 when there is only 1 Life Points.png remaining)
  • King's Staff.png King's Staff (friendly units receive 1 SP every 2 seconds when there is only 1 Life Points.png remaining)
Available Squads All
Environment Four random Enlightenments are given at the start.
Rewards
Nucleic Crystal Sinter.png
1
Grindstone Pentahydrate.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15

Seize Victory

In these Deep Dives, Calls of We Many are more likely to be heard and Temporary Recruitment Operators are more likely to appear.

#3-1: Fully-Armed
IS3 Investigation 3-1.png
A solid wall can repel all threats.

Mission Objective Enter 8 combat nodes.
Starting resources
4 Life Points.png 6 Hope.png 8 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles
Available Squads All
Environment No changes
Rewards
Crystalline Electronic Unit.png
1
Transmuted Salt Agglomerate.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15
#3-2: Life From Death's Door
IS3 Investigation 3-2.png
Healers are more likely to become patients.

Mission Objective Enter 4 Emergency Operation nodes.
Starting resources
4 Life Points.png 6 Hope.png 8 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles
Available Squads All
Environment No changes
Rewards
Bipolar Nanoflake.png
1
Oriron Block.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15
#3-3: Ambush
IS3 Investigation 3-3.png
An army can also be every man for himself.

Mission Objective Complete the run with at least 3 Specialists recruited.
Starting resources
6 Life Points.png 6 Hope.png 8 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles
Available Squads All
Environment Specialist Rec. Voucher.png Specialist Rec. Voucher are more likely to be obtained.
Rewards
D32 Steel.png
1
Incandescent Alloy Block.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15
#3-4: Roundabout Tactics
IS3 Investigation 3-4.png
Success is in the details.

Mission Objective Complete the run with at least 3 Supporters recruited.
Starting resources
6 Life Points.png 6 Hope.png 16 Originium Ingot icon.png 1 die roll 0 Key icon.png 6 Squad size
Initial Operators No restrictions
Initial Collectibles
Available Squads All
Environment Supporter Rec. Voucher.png Supporter Rec. Voucher are more likely to be obtained.
Rewards
Nucleic Crystal Sinter.png
1
RMA70-24.png
2
Tactical Battle Record.png
10
LMD.png
10K
Skill Summary Volume 1.png
15

Strategy

Abyss Rejection

In Abyss Rejection Deep Dives, the player will start with a lower Light than usual of 70, thus one must pray that their Operators don't get a Rejection as early as 2F, which can mess things up! To make things worse, the Light loss from clearing an operation after losing Life Point(s) is doubled to 10, forcing the player to be extra careful lest their Light falls low enough to make Rejections occur more often!

Speaking about Rejections, they are also enhanced, which will be explained in the specific strategies below.

Esthesia Lapse
In this Deep Dive, the Rejection is fixed to Neurodegeneration+ where compared to the normal Neurodegeneration, the Freeze duration is doubled, stopping the Operator dead in their tracks for 30 seconds, but to compensate, their ATK and DEF will be tripled whilst the Operator is Frozen by said Rejection, and the player is given Castle's Offspring.png Castle's Offspring to increase Operators' defenses after they are deployed long enough. To complete the Mission Objective, the player must make their way into 5F.
Exacerbated Mutation
In this Deep Dive, the Rejection is fixed to Metastatic Aberration+ where compared to the normal Metastatic Aberration, the Operator's HP, ATK, DEF, DP cost, and redeployment time are cut by a sheer 75% but their initial SP is increased by a grand 80, and the player is given Rhodes Island Tactical Transceiver.png Rhodes Island Tactical Transceiver and Four-Leaf Clover Fossil.png Four-Leaf Clover Fossil to expand the Rec. Voucher and Collectible options. To complete the Mission Objective, the player must recruit 15 Operators other than the initial three ones.
Adrenaline Rush
In this Deep Dive, the Rejection is fixed to Hemopoetic Inhibition+ where compared to the normal Hemopoetic Inhibition, the HP loss is doubled to a grand 300 HP per second but the Operator's ATK will be increased by 1.2% for every 1% of their missing HP (e.g. the Operator has +60% ATK at 50% HP) to compensate, and the player is given Coin-Operated Toy.png Coin-Operated Toy and Chivalric Commandments - New Edition.png Chivalric Commandments - New Edition to increase friendly units' ASPD by 8 for every 5 Originium Ingot icon.png in their possession! To complete the Mission Objective, the player must obtain 50 Originium Ingot icon.png other than those given at the start.
Mania
In this Deep Dive, the Rejection is fixed to Concentration Disorder+ which is similar to the normal Concentration Disorder but with the added effect of increasing the Operator's ATK by 2% and reducing their ASPD by 2 every second when their skill is not active, which caps at +60% ATK and -60 ASPD, and will reset after the skill expires, and the player is given Three-Key Contract.png Three-Key Contract to give 3 Key icon.png at the start. To complete the Mission Objective, the player must spend 3 Key icon.png.

Heed the Call

In Heed the Call Deep Dives, the player will be able to receive Enlightenments even if their Light is below 100 by rolling a 6 or higher (8 or higher at 0 Light) in die rolls upon entering a new floor, and Enlightenments are enhanced:

  • Ursus' Warcry becomes Ursus' Warcry+ which lasts for no less than 5 minutes instead of 30 seconds, effectively making it permanent in most operations!
  • Yan's Viccisitudes become Yan's Viccisitudes+ where the SP generated is doubled.
  • Columbia's Inspiration becomes Columbia's Inspiration+ which gives a grand 120 Command EXP, enough to bump the Command Level by at least three in one sitting!
  • Sami's Tenacity becomes Sami's Tenacity+ where the HP regeneration is doubled.
  • Victoria's Honor becomes Victoria's Honor+ where the dodge proc chance is increased to 55%, slightly better than 12F and Durin's talents combined!
  • Leithanien's Elegance becomes Leithanien's Elegance+ where the defense buff is increased to 500 DEF and 50 RES, essentially rendering weaker ranged enemies only scratching ranged Operators and allowing them to resist stronger ranged enemies better!
  • Sargon's Generosity becomes Sargon's Generosity+ which gives no less than four random Collectibles!
Terra's Dawnlight
In this Deep Dive, the player is given Inquisitor's Scripture Cloth.png Inquisitor's Scripture Cloth which gives 1 die roll after clearing operations. To complete the Mission Objective, the player must make 7 die rolls.
Parliament's Messenger
In this Deep Dive, the player will have Victoria's Honor+ at the start and is given Old Steam Armor 2.png Old Steam Armor. To complete the Mission Objective, the player must obtain 30 Hope.png other than those given at the start.
Empresses' Voice
In this Deep Dive, the player will have Leithanien's Elegance+ and a random Enlightenment at the start, and are given Broken Wand - Arts Weaving 2.png Broken Wand - Arts Weaving and Broken Wand - Malediction 2.png Broken Wand - Malediction which makes Casters more hard-hitting but more squishy (although the Elegance's effects offsets this to a degree). To complete the Mission Objective, the player must obtain 15 Collectibles other than the aforementioned.
Coronation
In this Deep Dive, the player will start with only a single Life Point but will have four random Enlightenments at the start and are given three "King's" Collectibles to offset that: Collectible not found , King's New Lance.png King's New Lance, and Collectible not found , thus so long as the player has only 1 Life Points.png, friendly units will have +150% ATK and +50 ASPD, and generates 1 SP every 2 seconds. To complete the Mission Objective, the player must simply complete the run.

Seize Victory

In Seize Victory Deep Dives, Call(s) of We Many have a higher probability to be heard but Temporary Recruitment Operators also have a higher probability to appear.

Fully-Armed
In this Deep Dive, the player is given Hand of Diffusion 3.png Hand of Diffusion which give 2 SP to Blast and Chain Casters, as well as Fortress Defenders whenever they damage an enemy, Hand of Spikes.png Hand of Spikes to cause enemies being blocked by (Arts) Protector and Duelist Defenders to take Arts damage over time, and Iron Guard - Moving Fortress.png Iron Guard - Moving Fortress to buff Defenders' max. HP, ATK, and block count for a short time after deployment. To complete the Mission Objective, the player must enter 8 combat nodes.
Life From Death's Door
In this Deep Dive, the player is given Collectible not found which causes enemies inside the range of Bard Supporters, Phalanx Casters, and Therapist Medics to take Arts damage over time, Nachzehrer's Cane.png Nachzehrer's Cane which deals Arts damage to enemies nearby an "overhealed" friendly unit, and White Flower Crown.png White Flower Crown to boost healing received by friendly units. To complete the Mission Objective, the player must enter 4 Emergency Operation nodes.
Ambush
In this Deep Dive, the player is given Collectible not found which buffs the ASPD of Ambusher, Dollkeeper, and Executor Specialists when no friendlies are adjacent to them as well as Rusted Blade - Isolation 2.png Rusted Blade - Isolation and Rusted Blade - Overwhelm 2.png Rusted Blade - Overwhelm which buffs the ATK and DEF of Specialists and boosts the shift force delivered by Specialists, respectively. Furthermore, Specialist Rec. Voucher.png Specialist Rec. Voucher will appear more often than other Rec. Vouchers. To complete the Mission Objective, the player must simply complete the run with at least three Specialists recruited.
Roundabout Tactics
In this Deep Dive, the player is given Collectible not found which causes Abjurer, Decel Binder, and Hexer Supporters to deal Arts damage equal to a portion of the target's HP in each attack as well as Collectible not found and Stalwart Aid - Diligence 2.png Stalwart Aid - Diligence which buffs the ATK of friendly units in a Supporter's range and cuts the SP cost of Supporters' skills, respectively. Furthermore, Supporter Rec. Voucher.png Supporter Rec. Voucher will appear more often than other Rec. Vouchers. To complete the Mission Objective, the player must simply complete the run with at least three Supporters recruited.